Identification of Lynch Syndrome

Area of Science:

• Genetics
• Oncology
• Hereditary Cancer Syndromes

Background:

• Lynch syndrome (LS) is an autosomal dominant hereditary cancer syndrome.
• It arises from pathogenic germline variants (PGV) in DNA mismatch repair (MMR) genes (MLH1, MSH2, MSH6, PMS2) or EPCAM deletions.
• LS significantly increases the risk of intestinal and extraintestinal cancers, notably colorectal and endometrial cancers.

Purpose of the Study:

• To summarize the key aspects of Lynch syndrome.
• To highlight the importance of early identification of at-risk individuals.
• To discuss the tools used for LS risk assessment and their limitations.

Main Methods:

• Review of clinical criteria for Lynch syndrome identification.
• Analysis of prediction models for assessing LS risk.
• Evaluation of universal tumor testing strategies.
• Discussion of limitations and mimics of Lynch syndrome.

Main Results:

• Pathogenic germline variants in MMR genes or EPCAM cause Lynch syndrome.
• Colorectal and endometrial cancers are the most common LS-associated malignancies.
• Multiple tools exist for identifying individuals at risk for LS.

Conclusions:

• Early identification of Lynch syndrome is essential for cancer risk management.
• Understanding diagnostic tools, their limitations, and mimics is critical.
• Effective strategies involve clinical criteria, prediction models, and tumor testing.